Guizhou Songhe Coal Mine Borehole Parameter Optimization Research

Guizhou Province is one of the provinces in China is rich in coal resources, but due to the complexity of the geological conditions of the mine in Guizhou Province, most of the mine coal seam gas content is relatively high, which mine of high gas and outburst accounted for more than 85% of the total number of mines and Guizhou Province coal mine gas disaster injury accident occurred frequently. At present, the gas drainage is the effective way to reduce the gas disaster accident. First, this thesis mainly based on the theory of fluid mechanics, seepage mechanics, prevention and control of gas and coal seam gas properties such as basis, combined with Songhe coal mine field data, the wear of borehole drainage mathematical model of coal seam gas, using MATLAB to obtain the theoretical numerical solutions and drainage radius; then, with the help of the FLUENT software numerical simulation wear layer borehole gas drainage and calculation result of the numerical analysed is built. Finally, on Numerical Simulation of drainage effective radius and field drainage radius are compared, and combining the expert opinion, put forward to optimize the extraction scheme of drilling parameters. Guaranteed by optimized wear layer drilling parameters can improve the gas drainage rate, safety and reasonable, economical hole, reduce the number of gas disaster in the coal mine safety production. The results of the effective radius of the pumping and the results of the numerical simulation are basically the same.